What’s the Difference Between IPv4 and IPv6? – Guru99
What is IP?
An IP (Internet Protocol) address is a numerical label assigned to each device connected to a computer network that uses the IP protocol for communication. An IP address acts as an identifier for a specific device on a particular network. The IP address is also called an IP number or Internet address.
IP address specifies the technical format of the addressing and packets scheme. Most networks combine IP with a TCP (Transmission Control Protocol). It also allows developing a virtual connection between a destination and a source.
Now in this IPv4 and IPv6 difference tutorial, we will learn What is IPv4 and IPv6?
What is IPv4?
IPv4 is an IP version widely used to identify devices on a network using an addressing system. It was the first version of IP deployed for production in the ARPANET in 1983. It uses a 32-bit address scheme to store 2^32 addresses which is more than 4 billion addresses. It is considered the primary Internet Protocol and carries 94% of Internet traffic.
What is IPv6?
IPv6 is the most recent version of the Internet Protocol. This new IP address version is being deployed to fulfill the need for more Internet addresses. It was aimed to resolve issues that are associated with IPv4. With 128-bit address space, it allows 340 undecillion unique address space. IPv6 is also called IPng (Internet Protocol next generation).
Internet Engineer Taskforce initiated it in early 1994. The design and development of that suite are now called IPv6.
IPv4 is 32-Bit IP address whereas IPv6 is a 128-Bit IP address.
IPv4 is a numeric addressing method whereas IPv6 is an alphanumeric addressing method.
IPv4 binary bits are separated by a dot(. ) whereas IPv6 binary bits are separated by a colon(:).
IPv4 offers 12 header fields whereas IPv6 offers 8 header fields.
IPv4 supports broadcast whereas IPv6 doesn’t support broadcast.
IPv4 has checksum fields while IPv6 doesn’t have checksum fields
When we compare IPv4 and IPv6, IPv4 supports VLSM (Variable Length Subnet Mask) whereas IPv6 doesn’t support VLSM.
IPv4 uses ARP (Address Resolution Protocol) to map to MAC address whereas IPv6 uses NDP (Neighbour Discovery Protocol) to map to MAC address.
Features of IPv4
Following are the features of IPv4:
Allow creating a simple virtual communication layer over diversified devices
It requires less memory, and ease of remembering addresses
Already supported protocol by millions of devices
Offers video libraries and conferences
Features of IPv6
Here are the features of IPv6:
Hierarchical addressing and routing infrastructure
Stateful and Stateless configuration
Support for quality of service (QoS)
An ideal protocol for neighboring node interaction
IPv4 vs IPv6
Difference Between IPv4 and IPv6 Addresses
IPv4 & IPv6 are both IP addresses that are binary numbers. Comparing IPv6 vs IPv4, IPv4 is 32 bit binary number while IPv6 is 128 bit binary number address. IPv4 address are separated by periods while IPv6 address are separated by colons.
Both are used to identify machines connected to a network. In principle, they are the same, but they are different in how they work. Below are the main differences between IPv4 and IPv6:
Basis for differences
Size of IP address
IPv4 is a 32-Bit IP Address.
IPv6 is 128 Bit IP Address.
IPv4 is a numeric address, and its binary bits are separated by a dot (. )
IPv6 is an alphanumeric address whose binary bits are separated by a colon (:). It also contains hexadecimal.
Number of header fields
Length of header filed
Has checksum fields
Does not have checksum fields
12. 244. 233. 165
Type of Addresses
Unicast, broadcast, and multicast.
Unicast, multicast, and anycast.
Number of classes
IPv4 offers five different classes of IP Address. Class A to E.
lPv6 allows storing an unlimited number of IP Address.
You have to configure a newly installed system before it can communicate with other systems.
In IPv6, the configuration is optional, depending upon on functions needed.
IPv4 support VLSM (Variable Length Subnet mask).
IPv6 does not offer support for VLSM.
Fragmentation is done by sending and forwarding routes.
Fragmentation is done by the sender.
Routing Information Protocol (RIP)
RIP is a routing protocol supported by the routed daemon.
RIP does not support IPv6. It uses static routes.
Networks need to be configured either manually or with DHCP. IPv4 had several overlays to handle Internet growth, which require more maintenance efforts.
IPv6 support autoconfiguration capabilities.
Widespread use of NAT (Network address translation) devices which allows single NAT address can mask thousands of
non-routable addresses, making end-to-end
It allows direct addressing because of vast address
Use for the designated network from host portion.
SNMP is a protocol used for system management.
SNMP does not support IPv6.
Mobility & Interoperability
Relatively constrained network topologies to which move restrict mobility and interoperability capabilities.
IPv6 provides interoperability and mobility
capabilities which are embedded in network devices.
Security is dependent on applications – IPv4 was not designed with security in mind.
IPSec(Internet Protocol Security) is built into the IPv6 protocol, usable with
a proper key infrastructure.
Packet size 576 bytes required, fragmentation optional
1208 bytes required without fragmentation
Allows from routers and sending host
Sending hosts only
Does not identify packet flow for QoS handling which includes checksum options.
Packet head contains Flow Label field that specifies packet flow for QoS handling
Address (A) records, maps hostnames
Address (AAAA) records, maps hostnames
Manual or via DHCP
Stateless address autoconfiguration using Internet Control Message Protocol version 6 (ICMPv6) or DHCPv6
IP to MAC resolution
Multicast Neighbour Solicitation
Local subnet Group management
Internet Group Management Protocol GMP)
Multicast Listener Discovery (MLD)
Has Optional Fields
Does not have optional fields. But Extension headers are available.
Internet Protocol Security (IPSec) concerning network security is optional
Internet Protocol Security (IPSec) Concerning network security is mandatory
Dynamic host configuration Server
Clients have approach DHCS (Dynamic Host Configuration server) whenever they want to connect to a network.
A Client does not have to approach any such server as they are given permanent addresses.
Uses ARP(Address Resolution Protocol) to map to MAC address
Uses NDP(Neighbour Discovery Protocol) to map to MAC address
Combability with mobile devices
IPv4 address uses the dot-decimal notation. That’s why it is not suitable for mobile networks.
IPv6 address is represented in hexadecimal, colon- separated notation.
IPv6 is better suited to mobile
IPv4 and IPv6 cannot communicate with other but can exist together on the same network. This is known as Dual Stack.
IPv4 vs. IPv6 Benefits – What is it? | ThousandEyes
What is IPv6?
IPv6 is the next generation Internet Protocol (IP) address standard intended to supplement and eventually replace IPv4, the protocol many Internet services still use today. Every computer, mobile phone, home automation component, IoT sensor and any other device connected to the Internet needs a numerical IP address to communicate between other devices. The original IP address scheme, called IPv4, is running out of addresses due to its widespread usage from the proliferation of so many connected devices.
What is IPv4?
IPv4 stands for Internet Protocol version 4. It is the underlying technology that makes it possible for us to connect our devices to the web. Whenever a device accesses the Internet, it is assigned a unique, numerical IP address such as 99. 48. 227. To send data from one computer to another through the web, a data packet must be transferred across the network containing the IP addresses of both devices.
Why Support IPv6? What are the benefits of IPv6?
IPv6 (Internet Protocol version 6) is the sixth revision to the Internet Protocol and the successor to IPv4. It functions similarly to IPv4 in that it provides the unique IP addresses necessary for Internet-enabled devices to communicate. However, it does have one significant difference: it utilizes a 128-bit IP address.
Key benefits to IPv6 include:
No more NAT (Network Address Translation)
No more private address collisions
Better multicast routing
Simpler header format
Simplified, more efficient routing
True quality of service (QoS), also called “flow labeling”
Built-in authentication and privacy support
Flexible options and extensions
Easier administration (no more DHCP)
IPv4 uses a 32-bit address for its Internet addresses. That means it can provide support for 2^32 IP addresses in total â around 4. 29 billion. That may seem like a lot, but all 4. 29 billion IP addresses have now been assigned, leading to the address shortage issues we face today.
IPv6 utilizes 128-bit Internet addresses. Therefore, it can support 2^128 Internet addresses—340, 282, 366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456 of them to be exact. The number of IPv6 addresses is 1028 times larger than the number of IPv4 addresses. So there are more than enough IPv6 addresses to allow for Internet devices to expand for a very long time.
The text form of the IPv6 address is xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx, where each x is a hexadecimal digit, representing 4 bits. Leading zeros can be omitted. The double colon (::) can be used once in the text form of an address, to designate any number of 0 bits.
With Dual-IP stacks, your computers, routers, switches, and other devices run both protocols, but IPv6 is the preferred protocol. A typical procedure for businesses is to start by enabling both TCP/IP protocol stacks on the wide area network (WAN) core routers, then perimeter routers and firewalls, followed by data-center routers and finally the desktop access routers.
ThousandEyes Support for IPv6
With IPv6 becoming more prevalent in cloud provider and consumer access networks, you may already be on the path to IPv6 deployment with your network and applications.
If you are looking to understand IPv6 in your environment there are three things you should be monitoring:
IPv6 DNS resolution
IPv6 traffic paths
IPv6 BGP prefixes and routes
ThousandEyes has support for IPv6 so that organizations can utilize IPv6 across all of their test types (web, network, voice, routing) and agent types (cloud, enterprise, endpoint).
ThousandEyes Cloud Agent support for IPv6 is provided on six continents allowing global coverage for organizations. ThousandEyes also supports the use of dual-stack IPv4 and IPv6 Enterprise Agents. Enterprise Agents can have both addresses assigned and executes tests based on a user-defined preference for only IPv4, only IPv6 or a preference for IPv6.
What is the difference between IPv4 and IPv6? – Juniper …
What is the difference between IPv4 and IPv6?
IPv6 (IP version 6), defined in RFC 2460, is the most recent generation of the Internet Protocol (IP) defined by the Internet Engineering Task Force (IETF). The first stable version of Internet Protocol (IP) was IPv4 (IP version 4). Whereas IPv6 is intended to eventually replace IPv4, they are tightly mingled right now—most engineers run them together.
Benefits of Using IPv6
The IP layer of the TCP/IP protocol stack is the most crucial piece of the whole Internet architecture. However, within ten years of IP going mainstream in the 1980s, the limitations of IPv4 in terms of scalability and capability became obvious. IPv4 requires several add-ons like ICMP and ARP to function. By the mid-1990s, a replacement scheme was developed. The move to IPv6 is necessary to accommodate the explosion of Internet requirements, Internet technology profile mandates that access via IPv4 and access via IPv6 have to coexist.
IPv6 offers these improvements over IPv4:
More efficient routing without fragmenting packets
Built-in Quality of Service (QoS) that distinguishes delay-sensitive packets
Elimination of NAT to extend address space from 32 to 128 bits
Network layer security built-in (IPsec)
Stateless address auto-configuration for easier network administration
Improved header structure with less processing overhead
How Do IPv4 and IPv6 Work?
The 128-bits in the IPv6 address are eight 16-bit hexadecimal blocks separated by colons. For example, 2dfc:0:0:0:0217:cbff:fe8c:0.
IPv4 addresses are divided into “classes” with Class A networks for a few huge networks, Class C networks for thousands of small networks, and Class B networks that are in between. IPv6 uses subnetting to adjust network sizes with a given address space assignment.
IPv4 uses class-type address space for multicast use (224. 0. 0/4). IPv6 uses an integrated address space for multicast, at FF00::/8.
IPv4 uses “broadcast” addresses that forced each device to stop and look at packets. IPv6 uses multicast groups.
IPv4 uses 0. 0 as an unspecified address, and class-type address (127. 1) for loopback. IPv6 uses:: and::1 as unspecified and loopback address respectively.
IPv4 uses globally unique public addresses for traffic and “private” addresses. IPv6 uses globally unique unicast addresses and local addresses (FD00::/8).
Juniper Networks Implementation
Juniper Networks complies with RFC 5952 in the standard assignment and display rules for IPv6 addresses. These rules mean that devices must accept all methods of address entry.
Junos Address Aware is an addressing and tunneling software portfolio for the MX Series routers that helps network operators conserve and extend their IPv4 address pool, ensure IPv4/IPv6 coexistence, and pragmatically transition to IPv6.